Tdonaly wrote:
Yep, and you're changing the subject. How does that wave, that flip flops
like a jump rope, move in and out of your coil?

Approximately the same way it does on a transmission line. When the
forward and reflected current are in phase at zero degrees, both are
flowing toward the load. Therefore, their sum (standing wave current
positive maximum) is flowing toward the load. When the forward and
reflected current are in phase at -180 degrees, both are flowing toward
the source. Therefore, their sum (standing wave current negative maximum)
is flowing toward the source. (This assumes that the source output is
the zero phase reference.) The standing wave reverses phase every 1/2
cycle. From Kraus: "... the phase is constant over a 1/2WL interval,
changing abruptly by 180 degrees between intervals."

Install a one ohm resistor at a current loop. Observe the voltage.
That voltage is a sine wave, proportional to the current, changing
polarity (direction) every 1/2 cycle. RF current simply cannot stand
still.

In a wire driven by an AC source, the current flows away from the source
for 1/2 cycle and then flows toward the source for 1/2 cycle. In a multi-
wavelength RF transmission line, the individual electrons may never make
it from the source to the load. Some electrons are just pumped back and
forth through the source.
--
73, Cecil http://www.qsl.net/w5dxp



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